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Page 



Additional Note to the Paper " On a supposed Alteration in the Amount of 



Astronomical Aberration of Light produced by the Passage of the Light 

 through a considerable thickness of Refracting Medium." By the Pre- 

 sident c 121 



Account of a Meteor that fell on the u Seven Stones" Light-ship, in a Letter 

 from the Secretary to the Corporation of the Trinity House, addressed to 

 the President 122 



January 23, 1873. 



Contributions to the History of the Orcins. — No. in. Amido-derivatives of 

 Orcin. By John Stenhouse, LL.D., F.R.S., &c 122 



Note on the Wide-slit Method of viewing the Solar Prominences. By 

 William Huggins, D.C.L., LL.D., F.R.S. . ." 127 



On the Fossil Mammals of Australia. — Part VIH. Family Macropodidj3 : 

 Genera Macropus, Osphranter, Phascolagus, Sthenurus, and Protemnodon. 

 By Professor Owen, F.R.S. &c 128 



January 30, 1873. 



Note on the Origin of Bacteria, and on their Relation to the Process of 



Putrefaction. By H. Charlton Bastian, M.D., F.R.S 129 



On Just Intonation in Music ; with a description of a new Instrument for 

 the easy control of all Systems of Tuning other than the ordinary equal 

 Temperament of Twelve Divisions in the Octave. By R. H. M. Bosan- 

 quet, Fellow of St. John's College, Oxford. ... 131 



On the Composition and Origin of the Waters of a Salt Spring in Huel 

 Seton Mine, with a Chemical and Microscopical examination of certain 

 Rocks in its vicinity. By J. Arthur Phillips, Mem.Inst.C.E 132 



List of Presents 134 



On Some Properties of Anhydrous Liquefied Ammonia. By G. Gore, F.R.S. 140 



No. 142.— February 6, 1873. 

 On the Osteology of the Hyopotamidce. By Dr. W. Kowalevsky 147 



Magnetic Survey of Belgium in 1871. By the Rev. S. J. Perry 165 



February 13, 1873. 



On Curvature and Orthogonal Surfaces. By A. Cayley, F.R.S., Sadlerian 

 Professor of Mathematics in the University of Cambridge 166 



On a new Relation between Heat and Electricity. By Frederick Guthrie, 

 F.R.S 168 



February 20, 1873. 



On the Anatomy and Histology of the Land-Planarians of Ceylon, with 

 some Account of their Habits, and a Description of two new Species, and 

 with Notes on the Anatomy of some European Aquatic Species. Bv H. 

 N. Moseley, M.A., Exeter College, Oxford , . . . 169 



On a new Locality of Amblygonite, and on Montebrasite, a new Hydrated 

 Aluminium and Lithium Phosphate. By A. 0. Des Cloizeaux 174 



